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Class Information
Number: 380/41
Name: Cryptography > Communication system using cryptography > Circuit switched network (e.g., wired telephone) > Having quantizing and subsequent normalizing of signal (e.g., reentry telephone circuitry)
Description: Subject matter wherein the message signal amplitude is divided into discrete amplitude ranges which are subsequently weighted and combined.










Patents under this class:

Patent Number Title Of Patent Date Issued
8650401 Network having quantum key distribution Feb. 11, 2014
8509446 Time-bin polarization format exchange technique for entangled optical source Aug. 13, 2013
8483394 Secure multi-party communication with quantum key distribution managed by trusted authority Jul. 9, 2013
8416950 Copy protection without non-volatile memory Apr. 9, 2013
8401186 Cloud storage data access method, apparatus and system based on OTP Mar. 19, 2013
7941673 Copy protection without non-volatile memory May. 10, 2011
7400724 Device and method for use in quantum crytography Jul. 15, 2008
7317796 System and method for video stream encryption Jan. 8, 2008
6959389 Secure entry of a user-identifier in a publicly positioned device Oct. 25, 2005
6947559 Random number generator based on turbulent convection Sep. 20, 2005
6801626 Cryptographic key distribution using light pulses of three macroscopic quantum states Oct. 5, 2004
6778669 Quantum encryption device Aug. 17, 2004
6711262 Procedure for the control of applications stored in a subscriber identity module Mar. 23, 2004
6701439 Call rejection interface for internet protocols Mar. 2, 2004
6498851 Data encryption and signal scrambling using programmable data conversion arrays Dec. 24, 2002
6175639 Digital data encode system Jan. 16, 2001
5995629 Encoding device Nov. 30, 1999
5668879 Audio scrambling system for scrambling and descrambling audio signals Sep. 16, 1997
5455861 Secure telecommunications Oct. 3, 1995
5434920 Secure telecommunications Jul. 18, 1995
5216692 Method and apparatus for adjusting a power control threshold in a communication system Jun. 1, 1993
5199074 Encryption system Mar. 30, 1993
5177785 Method and system for secure telecommunications Jan. 5, 1993
5159611 Variable rate coder Oct. 27, 1992
4985919 Secure communication control system Jan. 15, 1991
4979188 Spectrally efficient method for communicating an information signal Dec. 18, 1990
4852166 Analogue scrambling system with dynamic band permutation Jul. 25, 1989
4754481 Expanded partial response processing for analog signal enciphering and the like Jun. 28, 1988
4365111 Cipher apparatus for multiplex pulse code modulation systems Dec. 21, 1982
4343970 Signaling system Aug. 10, 1982
4283602 Cryptographically secure communication system Aug. 11, 1981
4278840 Dynamic frequency and time voice encryption system and method Jul. 14, 1981
4178474 Signaling system Dec. 11, 1979
4156108 Pulse producing system for secrecy transmissions May. 22, 1979
3983326 Key pulse generator for secrecy signalling circuit Sep. 28, 1976
3983327 Electrical signaling Sep. 28, 1976
3979558 Signaling system Sep. 7, 1976
3976839 Telephone privacy system Aug. 24, 1976
3968454 Signaling circuit Jul. 6, 1976
3967067 Secret telephony Jun. 29, 1976
3965297 Secret communication signal generating system Jun. 22, 1976
3965296 Signaling system Jun. 22, 1976
3953678 Speech component key signaling system with code combinations Apr. 27, 1976
3953677 Key signaling system with multiple pulse generators Apr. 27, 1976
3944744 Matrix coding secret signalling system Mar. 16, 1976
3944745 Secret signaling system with means for preventing key disclosure Mar. 16, 1976
3934078 Key generating system Jan. 20, 1976











 
 
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